a weft insertion control apparatus for a multi - color jet loom comprises a plurality of solenoid valves for controlling supply of a pressurized fluid to weft inserting auxiliary nozzles , an on / off controller for controlling these valves independently of one another , a first memory for storing a weft color selection pattern , and a second memory for storing on / off timing for the individual valves on a weft basis . the on / off controller reads out the weft color selection pattern stored in the first memory for every rotation of the loom and selects the preset on / off timing from the second memory on the basis of the result of the reading thereby controlling the valves .