HJ-851 single nozzle plain shedding water jet loom has been overall improved and strenthened from let-off, shedding, take-up, transmissiom system and stability. Therefore, it has the advantage of high-speed operation, continuious stability and wide applicable sphere. This machine can be equipped with single pump double nozzle free abb choosing system, double pump double nozzle free abb choosing system, double pump triple nozzle free abb choosing system; cam shedding device, dobby shedding device; electronic let-off and electronic take-up.