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The foldable baby stroller frame comprises a collapsible wheeled frame, a foldable upper frame, and at least a release mechanism. The collapsible wheeled frame comprises at least a front strut, a pair of rear struts and a lockable swivel base. The lockable swivel base is pivotally connected with the

The foldable baby stroller frame comprises a collapsible wheeled frame, a foldable upper frame, and at least a release mechanism. The collapsible wheeled frame comprises at least a front strut, a pair of rear struts and a lockable swivel base. The lockable swivel base is pivotally connected with the front strut and the rear strut, including a spring-loaded abutting slider for fixing the front strut and the rear strut in a using position. The release mechanism is manipulated by rotating a pair of push arms, when the push arms is rotated upwardly to a upright position, the spring-loaded positioning member is disengaged to permit the foldable upper frame changing its direction, and when the push arms is rotated downwardly, the spring-loaded abutting slider is refracted to permit the front strut and the rear strut rotating relative to each other.

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1. A foldable baby stroller frame, comprising: a collapsible wheeled frame, having at least a front strut, a pair of rear struts, anda lockable swivel base having a vertical shaft hole and being pivotally connected with the front strut and the rear struts; the lockable swivel base including an abutt

1. A foldable baby stroller frame, comprising: a collapsible wheeled frame, having at least a front strut, a pair of rear struts, anda lockable swivel base having a vertical shaft hole and being pivotally connected with the front strut and the rear struts; the lockable swivel base including an abutting slider biased by a resilient member for fixing the front strut and the rear struts in a using configuration;a foldable upper frame being pivotally connected with and supported by the lockable swivel base, and comprising a swivel rack having an U-shaped arm with two distal ends and a vertical shaft pivotally inserted and connected in the vertical shaft hole, a push arm for pushing the baby stroller frame, and a joint lockably connected between the swivel rack and the push arm; anda release mechanism operatably mounted on the foldable upper frame for releasing the front strut and the rear struts from the using configuration to a folded configuration. 2. The foldable baby stroller frame of claim 1, wherein the abutting slider is associated with the release mechanism through a lower flexible connecting member. 3. The foldable baby stroller frame of claim 1, wherein the foldable upper frame further comprises a pair of mounts connected with the distal ends of the U-shaped arm for detachably supporting a seat supporting frame. 4. The foldable baby stroller frame of claim 3, wherein the mounts each have a connecting member, and the seat supporting frame has a pair of sockets for detachable engagement with the connecting member. 5. The foldable baby stroller frame of claim 3, wherein the foldable upper frame further comprises a pair of mounts connected with the distal ends of the U-shaped arm for detachably supporting a baby carrier. 6. The foldable baby stroller frame of claim 5, wherein each of the mounts has a connecting member, and the seat supporting frame has a pair of sockets for detachably engaging with the connecting member. 7. A foldable baby stroller frame, comprising: a collapsible wheeled frame, having at least a front strut, a pair of rear struts, anda lockable swivel base pivotally connected with the front strut and the rear struts; the lockable swivel base including an abutting slider biased by a resilient member for fixing the front strut and the rear struts in a using configuration;a foldable upper frame pivotally connected to and supported by the lockable swivel base; anda release mechanism operatably mounted on the foldable upper frame for releasing the front strut and the rear struts from the using configuration to a folded configuration,wherein the release mechanism comprises:a slidable driving member release actuator movably mounted to the foldable upper frame;a driving member slidably having a skewed guiding slot;an upper flexible connecting member having a lower end slidably engaged within the skewed guiding slot and an upper end connected with the release actuator;a resilient member for biasing and keeping the driving member in a locked position; andthe foldable upper frame comprises:a swivel rack having an U-shaped arm with two distal ends and a vertical shaft pivotally supported and connected with the collapsible wheeled frame;a pair of mounts, each having a connecting member and an inner periphery formed with a plurality of positioning slots for slidably engaging with the driving member;a pair of joints, each pivotally coupled with one of the pair of mounts and formed with a space for receiving the resilient member and the driving member; anda push arm having two ends connected with the pair of joints for lockably pivoting about the pair of mounts. 8. The foldable baby stroller frame of claim 7, wherein the driving member is engaged with the plurality of positioning slots in the locked position so as to lock the pair of joints. 9. The foldable baby stroller frame of claim 8, wherein the pair of joints is unlocked by pulling the upper flexible connecting member upwardly, thereby forcing the driving member to move against the biasing of the resilient member and disengage from the plurality of positioning slots. 10. The foldable baby stroller frame of claim 8, wherein the release mechanism further comprises: a driven member having a ramp formed on one side thereof and retractably engaged with the driving member and driven by the driving member to rotate while the pair of joints are unlocked;a slider biasing by a resilient member and having one end for slidably abutting on the ramp of the driven member; anda lower flexible connecting member having an upper end connected with the slider, and a lower end for associating with the pair of lockable articulated arms. 11. The foldable baby stroller frame of claim 10, wherein the slider is driven by the ramp while the pair of joint is unlocked and the driven member is rotated by the driving member, thereby to pull up the lower flexible connecting member upwardly. 12. The foldable baby stroller frame of claim 10, wherein the pair of lockable swivel base 15 is unlocked by rotating the push arm downward while the pair of joint is unlocked by moving the slidable driving member. 13. The foldable baby stroller frame of claim 7, further comprises a positioning member operatively mounted in the lower end of the swivel rack for retractably engaging with the lockable swivel base to fix the direction of the foldable upper frame;a resilient member biased against the positioning member to engage with the lockable swivel base; anda third connecting member associated between the positioning member and the release mechanism. 14. The foldable baby stroller frame of claim 13, wherein the lockable swivel base has at least one indent for engaging with the positioning member for fixing the direction of the foldable upper frame. 15. The foldable baby stroller frame of claim 13, wherein the release mechanism is manipulated by rotating a pair of push arms of the foldable upper frame. 16. The foldable baby stroller frame of claim 15, wherein the positioning member is disengaged with the swivel rack when the pair of push arms are rotated upwardly to a upright position to permit the foldable upper frame to change the direction thereof. 17. The foldable baby stroller frame of claim 15, wherein the abutting slider is pulled by the lower flexible connecting member to allow the front strut and the pair of rear struts rotating to rotate relative to each other, when the pair of push arms are rotated downwardly.