City group network is a product of urban advanced stage, and a consequence of collaborative development of innovative units. Its dynamic evolution provides an effective circulation channel for innovative resources among resources-based cites. This paper establishes an urban group economic network among resources-based cities, and discusses its developing characteristics and evolutionary trend, providing references for promoting innovative capacities in resources-based cities. Based on 11 cities' data of Harbin-Changchun city group from 2009 to 2018, this paper uses revised gravity model and fixed effect model to establish a city group economic network which is used to study the impacts on their innovative capacities. The network density of Harbin-Changchun city group is in a rising trend, but at a low-level. Its network centrality shows polarization with some cities marginalized, and some localized groups emerging. City group network in/out degrees positively impact resources-based cities'innovative capacities at 1% and 5% significance levels respectively. Structural hole index is not related to the innovative capacities.Harbin-Changchun city group needs to optimize its economic network structure, to increase Harbin's and Changchun's radiation and leading roles to form an internal complicated network, to fasten their infrastructure so as to improve their trans-city communication inside the city group economic network,and to construct trans-regional innovative cooperating mechanism to increase the innovative capacities of resources-based cities.

As China's economic structure is being adjusted, resources based cities transformation has become a significant part of China's economic sustainable development, in which transformation policy plays a key role in transformation speed, direction and size. This paper uses policy tool classification, coding and frequency statistics to quantitatively analyze 47 pieces of transformation policies regarding resources\|based cities in China by means of PMC model. All levels of policy tools are of structural imbalance with governmental preference for environmental policy tools. Policy tools use is inconsistent, with policy supervision and evaluation missing. PMC index of 47 pieces of policies are qualified, but some get low scores in a few evaluation variables. Balancing policy tool structures and multiple-dimensional evaluation of policies may promote the transformation of resources based cities.