Theoretically, four broad and overlapping low-lying 10N resonances are expected which may not be clearly identifiable only with the excitation function. In order to resolve very wide resonance states overlapping with each others, we plan to measure vector analyzing power together with excitation function. The level structure of 10N is important to discuss resonances in 10Li since 10N and 10Li are mirror nuclei that are expected to have similar structure. The 10Li structure provides us with valuable information for constructing the three-body model of the borromean 11Li nucleus. Test experiment was conducted at RIPS, RIKEN where we measured excitation function with 4.2MeV/u low-energy 9C beam. In the presentation, results of the test experiment will be presented. Need for analyzing power measurement will be discussed to identify broad and resonances in 10N structure.