To　study　the　injection　characteristics　the　double-solenoid　valve　system　is　designed　in　different　conditions,　and　double　solenoid　valve　test　system　and　a　test　platform　and　built　to　complete　the　test　content.　Conditions　on　the　regulation　of　the　same　target　features,　performance　and　low-speed　jet　loop　dynamic　adjustment　of　performance　between　the　test　result　analysis.　Results　show　that　double　solenoid　valve　system　on　the　same　target　conditions　can　be　quickly　and　easily　change　the　injection　characteristics,　enhanced　fuel　injection　characteristics　of　the　controllability　of　the　system,　through　the　two　valves　are　open　and　flexible　combination　of　timing　control,　low　speed　engine,　they　can　easily　achieve　high-pressure　fuel　injection,　by　changing　the　control　valve　and　the　duration　of　time,　two-valve　system　can　be　quickly　and　flexibly　adjust　the　diesel　engine　fuel　injection　characteristics　of　each　work　cycle　to　meet　the　needs　of　the　engine　in　different　conditions,　can　greatly　improve　engine　performance　and　low　speed　start-economy　and　emissions.　©　2011　IEEE.