Compared to the schematic and pcb layout, i found the via near L99 in wrong position, i should be behind the output cap C741.
The input cap C739 was not very perfecter.
I check the sw waveform, it's bad. The output point waveform through Spectrum Analyzer is not very good too.
I have no idea how to improved the performance, now i add a ferrite bead in sw point.
may i know your suggest ,thanks
Spectrum Analyzer Waveform:
Customer schematic :