To study the effect of different bulk curings for tobacco drying on chemical and technological properties of tobacco Coker 347 in Guilan, a plan was implemented in the design of factorial randomized complete block with 3 replications. The project was evaluated as a factor in bulk curing type A in 4 levels and harvest or leaf position as a factor B in 3 levels. Qualitative and quantitative properties of flue-cured tobacco are influenced by many environmental factors, agricultural and processing technology and these factors create a lot of variation in physical and chemical properties and tobacco taste. Meanwhile, technological processing and drying is very important. The different structures of the traditional bulk curing, semi-modern and modern systems that can control temperature, humidity and ventilation, cause tobacco processing differences together in terms of physical, chemical and taste. Traits include percent sugar recovery, percentage of total sugar, percent nicotine, sugar recovery ratio of total sugar, filling power and economic comparison of different bulk curing. Data were analysed with statistical software SAS. Tables of results of analysis of variance show that there is no significant difference between types of bulk curing (factor A) during 2 years in terms of impact on the percentage reducing sugar, total sugar and nicotine content of tobacco, but significant difference at 5% level in terms of impact on the reducing ratio of sugar to total sugar and filling power. Tobacco processing showed another significant difference at 5% level in terms of harvest (factor B) in reducing sugar, total sugar, nicotine, and filling power, but no significant difference in the reducing ratio of sugar to total sugar. Mean treatments using LSD (Least-Squares Deconvolution) for average reducing sugar showed that tobacco cutter-leaf dried in bulk curing corrective JTI (Japan Tobacco International) had the highest average, tobacco cutter-leaf dried in a traditional bulk curing with the highest average total sugar, tips dried leaves in modern bulk curing JTI highest average nicotine, priming-lugs dried in the bulk curing domestic reforms were the highest filling power.