The invention claims a flush type toilet bowl, comprising a toilet bowl provided with a toilet inlay therein, wherein an elastic ring, a clamping ring and a J-shaped sealing ring are arranged under the toilet bowl drainage hose in sequence, and a nut is further equipped for sealing the end faces of the toilet bowl and the toilet inlay; the toilet bowl is provided with a cavity for containing the clean water and a double water spray jets extended out from the water-jet nozzle; the cavity is provided with a hose connected with the four-way valve, the water-jet nozzle and the hand-pressed air pump, next to the air pump is a button with which you can flush the toilets by pressing it easily. The invention is developed as the gravity flush portable toilet and the cassette portable toilet by using the flush type toilet bowl as the basic universal part, thereby being used on the caravans. The cassette toilet is provided with the waste level indicator, the sealing valve and the handle performing perfect use under the condition without water and electricity. The toilet bowl and the developed toilet thereof in the invention can be interchanged excellently and cleaned or flushed conveniently without outside water source, furthermore, the invention is excellent in rigidity, impact resistance and tightness.