I present the code SP_Ace (Stellar Parameters and Chemical abundances Estimator) 
which derives stellar parameters Teff, log g, and chemical abundances [El/H] for 
10 elements from stellar spectra with spectral resolution between R=2,000 and 
R=20,000. SP_Ace relies on a library of General Curve-Of-Growth (GCOG) of a list 
of 4500 absorption lines identified in the wavelength ranges 5212-6900A and 
8400-8900A (the present wavelength coverage can be extended). All the transition 
probabilities of these line have been astrophysically calibrated. The present GCOG 
library has been built on 1D stellar models and under LTE assumption but it can be 
extended to 3D stellar models and NLTE assumptions. The code works particularly 
well at low-medium resolution (R<10,000), where the line profile is dominated by the 
instrumental profile and where the instrumental blending of the lines become severe. 
SP_Ace does not need user intervention, providing at the output Teff, log g, and 
chemical abundances [El/H]. I will show some examples of applications to the ELODIE 
spectra and the LAMOST spectra. The code is public available.