Abstract: The impact of temperature and pressure on the activity of Ti-Si powder's self-propagating reaction under the condition of shock was investigated in this paper. On the one hand, the samples of different compactness were loaded by the same intensity plane shock to study the effect of temperature on self-propagating reaction. On the other hand, the samples of identical compactness were loaded by the different intensity cylindrical shock to study the effect of pressure on self-propagating reaction; XRD and SEM tests were used to further determine the degree of self-propagating reaction of Ti-Si reactive powder. Experimental results show that:under the condition of plane shock, the sample of low compactness starts self-propagating reaction entirely, in other words, higher shock temperature is beneficial to reaction; under the condition of cylindrical shock, the sample of higher compactness starts self-propagating reaction entirely, in other words, high shock pressure is beneficial to reaction.