China has joined the SKA (Square Kilometre Array) since the early 1990s and made continuous contributions during this process, as SKA Advanced Instrumentation Program(SKA-AIP), we present an introduction of SNAP2(Smart Network ADC Processor 2) & GPU design for the backend of Wideband and multichannel usage, featuring the interleaved ADC up to 10Gsps@10bit or 16 inputs, million channels high spectral resolution and 40Gb/10Gb output rates. Also for the SKA dishes test, we present a brief introduction of the Dish Verification Antenna China (DVAC) and SKA-P with alignment calibration and Pulsar & H1 observation using FPGA and GPU based digital backend.