Abstract: Cultural factors influencing high yield and good quality Linum usitatissimum (Tianya 9) were investigated. The correlations between these factors and its yield were analyzed. Path coefficient and principal component analysis were conducted, adopting uniform design of the 8 cultivating factors, i.e. planting density (X₁), base nitrogen quantity (X₂), base phosphorus quantity (X₃), base potassium quantity (X₄), foliar fertilizer (potassium dihydrogen phosphate, X₅), foliar fertilizer (boron fertilizer, X₆), growth regulator (multieffect azole, X₇) and growth duration irrigation amount (X₈), aiming at exploring better cultivating plan of L. usitatissimum for Gansu Province. The results indicated that the factors influencing the yield of L. usitatissimum were X₁, X₇, X₂, X₃, X₅ and X₄ in a descending order. Simulation and optimization of the highest yield was further implemented. Frequency analysis showed that the cultivating factors resulting in yield higher than 173.58 kg·hm^-2 were 4.68-4.92 kg·hm^-2(X₁), 11.59-14.75 kg·hm^-2(X₂), 17.26-21.95 kg·hm^-2 (X₃), 7.00-12.50 kg·hm^-2(X₄), 1.41-1.81 kg·hm^-2(X₅) and 751.74-954.04 g·hm^-2(X₇).