This paper aims at the characteristics of large amount of test tasks and long test cycle of the large-scale phased array radar antenna, A high efficient multi-task plane near-field measurement system is introduced, based on traditional near-field measurement system, through adding a multi-functional signal simulator、single pole multiple throw RF switch and a dual polarized antenna with high isolation, the simultaneous test of the multi polarization and multi task comes true. Compared with conventional multitasking test system, the results show that the measurement time can be reduced by 200% or more, the measuring efficiency has been greatly improved, and the test accuracy can also meet the requirements.