Aiming　at　the　problem　of　high　dynamic　acquisition　when　spread　spectrum　communication　is　applied　to　navigation　satellite,　this　paper　studies　the　basic　principle　of　double　block　zero　filling　algorithm,　and　verifies　the　effectiveness　of　its　acquisition　by　simulation.　In　view　of　the　large　amount　of　computation　in　the　two-block　zero　filling　algorithm,　a　method　of　using　column　compression　is　proposed　to　reduce　the　computation　amount,　and　the　performance　loss　under　different　column　compression　conditions　is　given　through　simulation.　When　the　two-block　zeroing　algorithm　is　used,　the　performance　loss　is　captured　comprehensively.　When　the　column　compression　ratio　is　equal　to　4,　the　performance　loss　of　the　system　is　1dB,　and　the　calculation　amount　is　reduced　by　about　70%.　©　2021　ACM.