Study of Higgs Self-coupling at ILC

In this Analysis we investigated the possibility of the measurement of Higgs self-coupling at ILC through the process $e^{+}+e^{-}\to ZHH$ using fast simulation data. So far two combinations of decay modes: $Z\rightarrow q \bar q,H\rightarrow b\bar b, H\rightarrow WW^*$and$Z\rightarrow l \bar l, H\rightarrow b\bar b, H\rightarrow b\bar b$ were studied. Our preliminary results show that it is very challenging to suppress the huge standard model backgrounds effectively.