Wu, J.X. Cao, J.S. JACoW Publishing Geneva, Switzerland This talk will review beam diagnostics for CW and pulsed proton superconducting linac. Emphasis should be on those beam diagnostics developed for 10-25 MeV CW proton linac built by IMP and IHEP. The talk should present technical design and measurement results with beams by those beam diagnostic probes, and technical challenges and lessons learned can be also presented.