Dangchuan， Located in the junction area of Qilian and North Qinlin Orogenic Belts， has different granites occurring at different time. And these which are formed in Devonian are composed of Dangchuan intrusion and Huoyanshan intrusion. Based on the major and trace element， Sr—Nd isotope data， Dangchuan intrusion exhibit significantly higher SiO₂ (SiO₂=72.29%~73.40%)， K₂O(K₂O/ Na₂O=0.86~2.01) and Al₂O₃(A/CNK=1.05~1.20)， whereas， Huoyanshan intrusion shows conspicuous lowerSiO₂(with an average of 69.70%)， higher K₂O (K₂O/ Na₂O=1.14~1.88)， Fe₂O₃+FeO and MgO. Both the two intrusions belong to Shoshonitic Series with the features of perluminous rock(A/CNK>1.0)， relatively higher Ba，Zr，Rb，Sm，Ta，Th，Nb，∑REE and ∑LREE values， obvious Eu negative anomaly， Low δEu ( δEu = 0.36～0.61)；higher ratios of n(⁸⁷Sr）/n(⁸⁶Sr）i ( >7.070) and high δ¹⁸O_{SMOW(δ¹⁸OSMOW =+8.89‰~+11.08‰) contents， indicate the two intrusions are derived from partial melting of uppercrust material， showing the characteristics of SType granites， and are regarded as crustderived granites. We suggest that the petrogenesis of the granites may be a result of continental uplift during the period of postorogenics.}