The present application provides an NMOS type GOA circuit including: M cascaded GOA units, a Nth level GOA unit including: a forward reverse scan control circuit, a node signal control circuit, a node signal output circuit, a pull down circuit, and a output circuit; the forward reverse scan control circuit configured to perform a forward scan or a reverse scan according to a forward scan control signal or a reverse scan control signal; the output circuit including a first thin film transistor and a second thin film transistor, the node signal output circuit including a third thin film transistor, and the pull-down circuit including a fourth thin film transistor; wherein M≥N≥1, the high potential signal is a direct current signal, and the first and the drain terminal of the thin film transistor is one of a source and a drain, and the drain, the third terminal is a gate.