Аннотация:GIZERO facility, a multi-purpose apparatus for micro and picogravity experiments, is described. GIZERO consists of a vacuum capsule released from balloon altitude (40 km). Inside it simultaneously a payload free falls in picogravity condition. The expected residual acceleration is 10-12 g / √Hz for about 20÷25 seconds (50 seconds with a propelled capsule). GIZERO represents the unique facility to test and to calibrate high precision gravitational instruments and to perform extremely sophisticated experiments such as test of the Equivalence Principle (the gravity level can be reduced down to 10-15 g / √Hz using the cryogenic technique). The results of design and experimental study of main GIZERO subsystems are reported.