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Summary of Significant Principal Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Summary of Significant Principal Accounting Policies [Abstract]  
Schedule of concentration of customers and suppliers
The following customer accounted for 10% or more of revenue for the years ended December 31, 2015 and 2016:
 
 
 
For Year Ended December 31,
 
 
 
2015
 
2016
 
 
 
RMB
 
RMB
 
 
 
 
 
 
 
 
 
A
 
 
 
*
 
351,204
 
 
The following customer accounted for 10% or more of balances of accounts receivable as of December 31, 2015 and 2016:
 
 
 
As of December 31,
 
 
 
2015
 
2016
 
 
 
RMB
 
RMB
 
 
 
 
 
 
 
 
 
A
 
 
77,764
 
 
193,775
 
 
The following suppliers accounted for 10% or more of purchases for the years ended December 31, 2015 and 2016:
 
 
 
For Year Ended December 31,
 
 
 
2015
 
2016
 
 
 
RMB
 
RMB
 
 
 
 
 
 
 
 
 
B
 
 
257,069
 
 
629,780
 
C
 
 
317,576
 
 
551,459
 
D
 
 
245,427
 
 
 
*
 
* Not more than 10% or more.
Schedule of estimated useful lives and residual rates
The estimated useful lives and residual rates are as follows:
 
Classification
 
Useful years
 
Residual rate
 
Electronic devices
 
3 years
 
 
0% - 5
%
Vehicle
 
5 years
 
 
5
%
Furniture and office equipment
 
5 years
 
 
5
%
Machinery
 
10 years
 
 
5
%
Leasehold improvement
 
Over the shorter of the expected life of leasehold improvements or the lease term
 
 
0
%